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|
//! Tests if multiple generic parameters work, for the case that lifetimes are independent of mapping functions.
//! For simplicity, it just creates a FreeResult
use higher_free_macro::free;
use higher::{Functor, Bind, Apply};
free!(FreeResult<O,E>, Result<FreeResult<O,E>,E>);
#[test]
fn test_multiple_generics(){
let m : FreeResult<_, String> = FreeResult::lift_f(Ok(37u32));
let m = m.fmap(|x| x*2);
let m = m.bind(|x| FreeResult::Free(Box::new(Ok(FreeResult::Pure(x)))));
let f = FreeResult::Pure((|x| x*3).into());
let m = m.apply(f);
match m {
FreeResult::Free(b) => {
match *b {
Ok(f) => {
match f {
FreeResult::Free(b) => {
match *b {
Ok(f) => {
match f{
FreeResult::Pure(x) => assert_eq!(x, 37*6),
_ => unreachable!()
}
}
_ => unreachable!()
}
},
_ => unreachable!()
}
}
_ => unreachable!()
}
}
_ => unreachable!()
}
}
#[test]
fn test_multiple_generics2(){
let m : FreeResult<_, String> = FreeResult::lift_f(Ok(37u32));
let m = m.bind(|_| FreeResult::<u32, _>::lift_f(Err("An early out.".to_owned())));
match m{
FreeResult::Free(m) => {
match &*m {
Ok(m) => {
match m{
FreeResult::Free(m) => {
match &**m {
Err(e) => assert_eq!(e, "An early out."),
_ => unreachable!()
}
}
_ => unreachable!()
}
},
_ => unreachable!()
}
},
_ => unreachable!()
}
}
#[test]
fn test_multiple_generics3(){
let m : FreeResult<_, String> = FreeResult::lift_f(Ok(37u32));
let f : FreeResult<_, String> = FreeResult::Pure(|x : u32| -> f32 {(x as f32)*0.5f32}).fmap(Into::into);
let m = m.apply(f);
match m{
FreeResult::Free(m) => {
match &*m{
Ok(k) => {
match k {
FreeResult::Pure(k) => assert_eq!(18.5f32, *k),
FreeResult::Free(_) => unreachable!(),
}
}
Err(_) => unreachable!(),
}
},
_ => unreachable!()
}
}
|
